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Extracting Numbers from a Stacked Density Plot

Derek Jones digs into an image:

A month or so ago, I found a graph showing a percentage of PCs having a given range of memory installed, between March 2000 and April 2020, on a TechTalk page of PC Matic; it had the form of a stacked density plot. This kind of installed memory data is rare, how could I get the underlying values (a previous post covers extracting data from a heatmap)?

Read on for an interesting attempt at reverse-engineering the original numbers used to create an image. H/T R-Bloggers.